| 摘要 |
<p>PURPOSE: A readout circuit for a touch sensor is provided to prevent the overflow of a read out signal by considering of the peak value of the read out signal. CONSTITUTION: A comparing circuit(32) outputs a touch sensing signal by setting up the input range of a read out signal outputted from a read out line. An ADC(Analog-Digital Converter)(38) changes a touch sensing signal into digital sensing data. The comparing circuit includes a first and a second amplifier(34, 36), and a first and a second gain capacitor. The first and the second amplifier restricts the input range of the read out signal to a point between the first and the second standard voltage by directly connecting with the read out line.</p> |
